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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61df55f0117f7c48d2ed7c99ef302eab84a5a0d22ea122a33f9979cd36cac90a' 
  AND token = 'tPQ4kA2JI95fEq6N0MA9xQCzHoBzI6hE7vupo/QPah8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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