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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fde3b40619a46ac5e20114ea5562d6300180f03111336ddee964e2a2c84217' 
  AND token = '3Cc7c8pkqwnXbPKDAnmS2qNu+ZkMHrMfAA8D+iRowjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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