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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3295daa965d6e215f47f7ca8c6b1fa8f86d5b04fc310948e155764aa799f6e12' 
  AND token = 'JE9LlbyCIjn+c9q6Zwbt3qgsg8M9Sleg5JQB88gOJlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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