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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9308293352e1ef0f49c2edd2fdfcd6ac44cf5dbe549a649f6574c835dfae5fd0' 
  AND token = 'k4z1JE0Gbcty8PjBF+Ofy1cwZRDfO6lnKohd5owidro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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