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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca8cfe640c950d1f1fe41ed95ac3d9c8c0b2a2e75aec1377a7d2756f91b6d01' 
  AND token = 'G1eses5eatajQT3tp3hZzlkBONTocSbvUHqrDkkn+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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