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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4afc3de17b3f42e81a3c9e2cdd1ba7672150ca9262456f077d19e1bfa631961' 
  AND token = '2GrswWITNvUdKb+cek94sDcPscBX+nNLlDttuEfHt+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}