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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0940c68ed06d9db75adb24ba97d072be0e81b0f5a3539c1143775cb5a2e0d2d' 
  AND token = 'I0dFtCqeay/i15vrknc0HSlGZ4rloSonN7tpJI2qfvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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