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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6171be3d73d5b9a0eaeec258397108c6f312fa9c9db1b3c23362cab3f90c63f7' 
  AND token = 'wgC5vF9TNiA0zB3joauDp039PbYo5yLUcKrHVGKlxrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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