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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afb7e7e1c3ceb6b368a175189b918a7500f3346a72e03b042ba2d1ba7cc47ff' 
  AND token = 'OiuzD9Z9fUljJ3+Pin7hwF4o6QL8SnP84LtmlWWtno4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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