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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1673d7e1f247d5001459576177c7caa322aa529d5f0d69cfad1b7e43a4ce8c' 
  AND token = 'p0N81MFckbL7nsU5xQXn4kO3lguvQDzr4xad/tl9Ojo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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