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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebdb9ae38e5369a106362d62f77b3eebd14043eb73f79c18f5c91b01aa19b3c' 
  AND token = '0u2hyaEsV+W+CjzoTNibSm10mjH+sMtAhJm6Ifp8n1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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