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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48d18bfc0235260098484b3e43ff4b58d5cb6eb706df3280189bd96bee2fe1e' 
  AND token = 'jQouk5DLARU/3BxPT6chOaa4H7g9ZPWaph+5fvFhC3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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