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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358b163082f180470e8f380384a11648970c11b812b2b10e95966c3d13ce20e3' 
  AND token = 'T+bNuPxe3g1yn2FblTgkqe2T05J0R+agFa9GbsOXIG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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