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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b912c3a2e5e7c63d234f1cfc6f48dc80f603025afb731bda3ed51163ef6c9387' 
  AND token = 'TaLLlFBBnWOh9ynetGuKe5177qlfPCV1VGP7OXUxjhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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