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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13eab11a80fd1f50567b6a6031e3a97f8f504c714c88775f0c7318785b6faac' 
  AND token = 'sXi3P6d9YVWWG3qGSB8RrHbQGpDo9eCjd+4Bys/zivM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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