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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730a4676964a304df9e7adc296bdbd8a68d7b3607ef67dfe18535476f8514721' 
  AND token = '0pEjNBlWxJNOVfVYH27WXF4448r6/4S9EvS4Pr8cf2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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