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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3584ecc9e712a678fac4fb753f53b1729adb75a0191f96f5747344bed99495' 
  AND token = 'IStAalbEgArL5VqBQMvRFyymnIXTkjSx+xFOuS6B4Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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