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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd3e7a502f79cbd8702f99889901fcae9588e8cc68de6a3740caa1a617ba38e' 
  AND token = 'VOLY0u2Rq6jnDpbPS30z5Zo4iEpjm31KLbgD2s9tfGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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