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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98528e95db1de399be0ff023287e9abb933e46f56b4cf344705aacf4e29fd0e7' 
  AND token = 'YwUBu3cq3m1bsQidRDz6M2cJaZLisvbTwh1soee8mS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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