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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629be170fc03d371cb438b5f27d9bab191a23704ce2c470b5ae2193acce72d55' 
  AND token = 'ioiIexluHg3iz174nGZqybSkwb0pppwST8HmUT3ihfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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