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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352c3b431680355e47185bbcc289bdf86ee0bfd6a7ad0f91b3b85d04a3a0c51e' 
  AND token = 'whhtFQS2tMhW91W8TvjxyU25/fK8dQd1RTEsjAb92GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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