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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a936449bd972ad230482ced05c1888c60f742d9d780c884bb61459ef6423e76f' 
  AND token = 'ed/ntyu/bnIBoYvzFbE3KHWp+HuSOWd2ljA8t3Gp6gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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