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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac457dd8b2d09d7c62491dfa5e387bc8953f295741b4dbcde7882fe41b2d54ed' 
  AND token = 'K9wgsGHkpxuVSUEI1Wrb44aEqhzcUyDoEt26smNSTio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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