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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f0582ca9034310e063625350eda77b2c756b87adc426bdfae172339ca27db7' 
  AND token = 'LasJXrvb8WmIAeEkr3JAbg0Un1R/v8Xm0VMM8yqzc9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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