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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4453d6b537b1aeb90775bfe6cb4731b3de1017c61ddfe7d66395bdbe4a6928' 
  AND token = 'mZVQipQNO6aEW3U0CMTPAPHsiyc4c7/ZEYP6/V6M0iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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