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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34773d3fbaa7b8c4f08a0d0373e0158dfcb026f2e6434690a8dd2e4faf12c704' 
  AND token = 'pLzAtfKqE3xrrCB6Z76s4DNw3t5VCRlxpdyf6J/bmw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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