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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3d686f30d50749bf1cc03be54e259a4b7566a1b26144e8153d04337f75a082' 
  AND token = '2tXqxxBme6aOSxK3qn2DJekbiwx2xNqetjju5O9qk2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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