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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f23e6c03a112eda03a3e57c42afe4794ca6c8a6884673f62acd8f320cb6d52' 
  AND token = '9FehXsd6b8xnH6Ps+xLZv225jGnbRpybCFMyOjVXLIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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