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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8ec7aa8c63c009adce718d00a0b13eef73f42e012fea572341bbdef06d0169' 
  AND token = 'uDEOul/F4MRUpnqdVPGNnA85NsJDUw37bV9n77nj1Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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