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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ef9a71311f79e9f22b71d6674fa12cbc8914478081316d5756112aa2f4ad2a' 
  AND token = 'tDODsXk8unLwx2drZghjWrXP8X1JB30onj8YdZ4JOdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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