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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f1df0fcaa4775e1471d5ae6f2258b5d47175de9a3bc0138dcc2c2ffeeb1669' 
  AND token = 'n1qwl0xWgKpjTwy/EZkmDd5HMsOCyNSR/s1x+R8HSHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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