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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceef2aabdeb311af8ffc837900bc5f20f11fa92e92e20fd8b50b2946f3e72dc9' 
  AND token = 'ijTlMPjoNThArxpa/RfOQPT02coA/yaNqYjfDOcWdrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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