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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d57f3b5a99b0bdb4b4250d48fb23bfee39d0a8787fcc6fb61766f3abd679f3' 
  AND token = 'uO3iQFadAHeE4y/nfaOSCIO1YUq0OoyeIL0OrxVOaLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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