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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75b9b4163957380033288966fb49fd1a97bc09b86436f8472f87cc511abe226' 
  AND token = 'A1JyzdIPt2sRRjhtJ+KUs0W4hMyiQVMjyERauD70zGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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