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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016ee34fbf83971f12a10ac7ad75bec124dcc16354a5198d144208217f964b90' 
  AND token = 'VXC1w2IEx1F58jCKG5VoYwJLTFsy5bDFWJ+eAfuU2jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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