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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d46e0d1ecc319ca1141ad8fcc5faee7b9cdf9f88bce335a7fc7ee8a822ce167' 
  AND token = 'L7TfIj9k3idvI25J2gKgFkWYsGhYMYTvn56zoo60gOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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