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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968c47c2464d1a471babc23435c33d569b104fbe8b27dd972230c8fed5b8d16a' 
  AND token = 'bIF1SUni+e4bulVBvZYDtip70wtJQyME3JyAopcm4oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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