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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674b01a6b3ce829092fc712449e8f5959d6633ba1493ff67ce7d8960774892b3' 
  AND token = 'jT/L5UrXRT4yq3tMcL1uJnSsQkdlFuBK2bw3Iid14CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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