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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909c4b9c69a01076ad9b5ea323264518500cca1d2e9f8cae8d31584794c0b5bb' 
  AND token = 'YN5vCxuE1ve2M+oD0dL6+6dEoe1f4ytHuIOCtq6oUy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00570

JSON explain

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