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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23de349437bbcc0f90e5c66fb7a9bc0b41bd68aa0d3cff0d9c36d0ef9bdcbae2' 
  AND token = 'K66kX7s99eB/ZQJ+FMlxgQOOOTLQREaXF9QyGKRSKOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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