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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af672abe1468355cb38e3c2ec0bcad07dc334cf1873bcd6074b67ee66357d998' 
  AND token = 'SEuCM/TKNuCkgY5YUNI2yfKZ+woHAtSyqg+R4bpqtcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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