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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fafbaf012288ce7bb6b164d70ac2a896de3a323c55f550c9142b0bc9840bb07' 
  AND token = 'ltzVpu0Q1J6wT7GWPxibEkiBf/DdybW69DPD0lG5zYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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