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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e3d5f4e07c2d9494185334d91bef15a4870af0c32243147069696a0ebf4063' 
  AND token = 'WwJwC7tVdUBoPhAw/DJ1srR+4bdXXFnlQ/2acT2y1EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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