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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b6417298468084c6ccad0327597ed96b8b63cd09955351f215388f48b91b1c' 
  AND token = 't9n/mdn5HJcB/EiIaVHS1iF7iezvW70ikKGPpFebwNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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