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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7c504c2903d382aa0f5122bb67e8c2e30e296efe77891be749f98a14069e86' 
  AND token = '4ht84kvi/d26UJ/4Nu2yUZhRt5OwvPhHPD7K9CxuUfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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