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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c758e114695d5fd5ef9d170aa27abe0d1d72209a6bfa0614c03757b7be7640' 
  AND token = 'zZ2KgRglL34IflU2hJOlaq2aQmjBdaeZZS3wNpHe68w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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