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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafc94b2719cfe47b73f7b37a7a63a4ab27e907417d1472a64e930b8eb319a98' 
  AND token = 'nZxBKVvCc5S+lkkz1HSVRCHlNauAMRGFp3Vjc8MDNpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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