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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2bfc4114ff2a3872fc40de7058ca7aa12d6e07285786e7a5b17ac6dddfc7ec' 
  AND token = 'W2bMGC8/M57789yA969g6+nHDQigdRQvsy1EJLQmjR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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