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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f059745f161bd9b60c7c98efb26646e42d810e5da4ea84954660f3feb6ec0e43' 
  AND token = '/YU9ouaWN/hu0UtKxW52nh5VSXnBPYVfSVCkiX+6OmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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