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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0841ff407ac5095507b77509e703df2f285cec3f4b4c7c6a0a19e4231d307d01' 
  AND token = 'OHtkrcfZEVXiiTCt/tX0ZOGfUxu4YQECnWopBK3fu+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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