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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e94aac9b07c5ed3a927ca0c87fdbbd7b407600632cd673027c16d8ed41a989' 
  AND token = 'x0L2YA2QxaD4cByEA9/u6I7fBHJHFDtTBomSP7l1Ov4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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