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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64428d37565c913ad98682779eb7148095585ddaf9768ec60238f0e6d4574a48' 
  AND token = 'A9y08wQVoEZKqE32XxnlLwy8u9akK545wksjeShtoxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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