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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4618d5828a7efa6b738b5569215c3e2189e6bc49fa3be863f13db90e9362cd0' 
  AND token = '1c/utJqRR4SO9e16d1cNVAGnIp3qoI1Rj+H5OZpBn0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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