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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85ba007abc59cdd38c51d3c0acb5ddba767f6582cc9602a73d48a25a77dc55d' 
  AND token = 'NUw5bQhGk8IK+Aaq7iid55F43jqqvtnfZLbRKig/WsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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