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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b395663d32fa47da7a266428e4883757fee6b7d36a1fc2bc2e6c9f86dccc807c' 
  AND token = 'z3KWkuOSnzNwT8fuf8K1zAzFcdf1MXIxlbqCnOGXDjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00194

JSON explain

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